Date: Mon, 18 Jan 1999 13:21:43 +1300 (NZDT) From: Jonathan Chen <jonc@pinnacle.co.nz> To: Marcia Perry <mperry@george.lbl.gov> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: RS232 communication Message-ID: <Pine.SCO.3.96.990118131659.26106A-100000@kiwi.pinnacle.co.nz> In-Reply-To: <199901180008.QAA17477@george.lbl.gov>
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[Please reply to the list, as you'd reach a wider audience, and
someone there may know the answer to your question ('cos I certainly
don't! Note Cc:]
On Sun, 17 Jan 1999, Marcia Perry wrote:
> Hi Jonathan,
> My question is how to send an SMPTE break character to
> a Panasonic WJ-MX20 video mixer/switcher? This mixer/
> switcher is an RS422 device for which we made a cable
> and are using an Antona ANC-6090 RS232-422 converter.
> The initialization of the Panasonic is to send it an
> SMPTE break character, wait 1 ms and read back an 84h,
> to indicate all is successful and the device is in the
> active state, ready to receive commands. Under LabView,
> all is working and the adapter passes a loopback test
> run on the PC. So we're pretty sure the cabling is
> right and the sequence is right. I've been told various
> things about that break char--send 'f0h', send '0fh',
> send a null followed by 30h. I tried these as well as
> the call to tcsendbreak() -- all with no luck. I seem
> to be reading back only the first byte I wrote. So I
> wondered if an SMPTE break character can be sent from
> software. If so, how? (One manual we got describes this
> break char as 17 to 20 bits of logical low or 0, followed
> by a minimum of 2 bits of logo
> logical high or 1).
>
> Thanks,
> Marcia
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